boat was over heating so i took the thermostat out. no water is getting to the housing. so i check the raw pump its fine. and the pipes are clear through from the strainer to the pump (no clogs).

Any idea?84848

Double D

09-29-2012, 06:24 PM

What does your impeller look like? That's what pulls the water into the engine.

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JimN

09-29-2012, 07:52 PM

How old is the raw water pump impeller? If you don't remember when it was installed, change it. You checked/cleaned the oil cooler, right?

mondos829

09-29-2012, 07:58 PM

impeller is 2 months. oil cooler is clean

mikeg205

09-29-2012, 08:03 PM

are you getting a good seal at the strainer? None problem if seal is not good...

bturner2

09-30-2012, 07:42 AM

Check valve on the hull fitting open? I managed to bump mine partially closed while cleaning the bilge one year. Drove me crazy trying to figure out why the boat was running warm until I stumbled across it while tracing the flow back to the source.

JimN

09-30-2012, 10:21 AM

Look in the thermostat housing cover- the hole forward of the thermostat location may have a chunk of impeller stuck in it. I have seen this on several engines that were overheating.

Lumbergh

09-30-2012, 10:32 AM

Looking at your picture, I would replace those rusted thermostat bolts.

New SS at Lowes or whatever.

Shearing one of those can make for a bad day.

Cloaked

09-30-2012, 02:24 PM

Raw water pump has a specific direction that it has to be replaced after removal.

mondos829

09-30-2012, 11:20 PM

impeller it was. 84880

mikeg205

09-30-2012, 11:23 PM

impeller it was. 84880

It's toast...thought you said you check in post #1?:confused:

mondos829

10-01-2012, 09:37 AM

I did. i saw the veins but didnt see how extensive the damage was. Best advice. try and blow through the pump. if air passes through impeller is done. Just ordered 2.

onewheat

10-01-2012, 01:17 PM

impeller is 2 months.

?????????????????????? That is the worst 2 month old impeller I've ever seen.

mikeg205

10-01-2012, 08:43 PM

?????????????????????? That is the worst 2 month old impeller I've ever seen.

The only thing I can think of is there was an interruption of water and the impeller over heated. OP mentions strainer - notorious for air inline if not sealed properly..... no water - heat...bye bye impeller..so sad...

Masterfull

10-01-2012, 11:44 PM

You will need to find all the pieces that came off of that impeller as well as any pieces that came off of any prior impellers.... Check all hoses and coolers down line from the pump....You may also find pieces of impeller in the intake hose prior to the pump... Backflush all the hoses and try to account for all missing vanes.... And by the way, where are you in the northeast....I'm in MA.

wheeler

12-19-2012, 08:09 AM

even new impellers can go bad. one common problem is the brass inner separating from the rubber, the impeller looks fine, but only the inner center is spinning....it baffled me for a couple hours on the lake one day.

if water pick up screen is clean, tranny cooler is clean, hoses on correctly......change the $40 impeller. :-)

blflak

09-14-2013, 10:00 PM

Just picked up my used boat last month and I think I am having this issue. No water feeding into the basket thus none to cool the engine. Got the new impeller and headed tomorrow.

mikeg205

09-14-2013, 10:03 PM

Just picked up my used boat last month and I think I am having this issue. No water feeding into the basket thus none to cool the engine. Got the new impeller and headed tomorrow.

Inspect trans cooler.. flush the trans cooler to make sure it's clear.... that will eliminate one source of problem.

coz

09-14-2013, 10:07 PM

even new impellers can go bad. one common problem is the brass inner separating from the rubber, the impeller looks fine, but only the inner center is spinning

Learned that lesson as well, I've had 2 that did this, one with very low hours.